<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>计算器</title>
</head>
<body>
  <div class="calculator J_calculator">
	<p>结果：<span class="result">0</span></p>
	<div class="input-group">
	  <input type="text" value="0" />
	  <input type="text" value="0" />
	</div>
	<div class="btn-group">
	  <button data-method="plus">+</button>
	  <button data-method="minus">-</button>
	  <button data-method="mul">*</button>
	  <button data-method="div">/</button>
	</div>
  </div>

  <script src="js/tools.js"></script>
  <script src="js/index.js"></script>
</body>
</html>